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(No Model.) a 2 Sheets-Sheet G. A. EARTH.

STOCK 0R TOOL HOLDER FOR DIRECT ACTING ENGINE S.

No. 409,659. Patented Aug. 27, 1889.

UNITED STATES PATENT OFFICE.

GUSTAV A. EARTH, OF ST. LOUIS,MISSOURI, ASSIGNORHU PIERRE CHOU- TEAU, OFSAME PLACE.

STOCK OR TOOL-HOLDER FOR DIRECT-ACTING ENGINES.

SPECIFICATION forming part of Letters Patent No. 409,659, dated August27, 1889.

' Application filed December 2'7, 1888, Serial No. 294,755. (No model.)I

To all whom, it may concern.-

Be it known that I, GUSTAV A. EARTH, a citizen of the United States,residing at the city of St. Louis, State of Missouri, have invented acertain new and useful Improved Stock or Tool-Holder for Direct-ActingEngines, of which the following is a full, clear, and exact description.

My invention relates to improved means for securing the chisel or othertool holder to the piston-rod of a direct-acting steam or pneumaticengine used for chipping, calking, riveting, mining, or other purposes,and has for its object to prevent the weakening and con sequent breakageof the piston-rod, which results when the tool-holder is keyed theretoin the usual manner.

It consists in a stock or tool-holder formed with a split socketcorresponding in shape to the end of the piston-rod which is insertedtherein, combined with a bolt or bolts which pass transversely throughthe wall of the socket and engage in notches in the pistonrod, wherebythe wall of the socket is tightly clamped and the holder firmly held tothe piston-rod.

On the accompanying drawings, Figure 1 represents a longitudinalelevation of my improved stock or tool-holder applied to the piston-rodof a direct acting miningengine, broken away; Fig.2, a similar viewthereof at right angles to Fig. 1; Fig. 3, a transverse sectional view011 line 1 1 in Fig. 1; Fig. 4, a longitudinal sectional view on line 22 in Fig. 1; Fig. 5, a similar view to Fig. 1, showing an alternativearrangement of the parts; Fig. 0, a transverse sectional view on line 32) in Fig. 5 5 and Fig. 7, a similar View to Fig. 3, showing amodification of my invention, like letters of reference denoting likeparts in all the figures.

Referring to Figs. 1 to 4, a represents my improved tool-holder, in oneend of which is keyed the chisel b, in the usual manner. In the otherend of the holder a is formed longitudinally and centrally with thechisel b a square (or other shaped) socket 0, corresponding to the shapeof the pistonrod (l and of suitable length within the holder at. Thewall 0 of the socket c is split or divided for its entire length, andpreferably at opposite angles 0 into two parts, between which the endportion of the piston-rod (1, corresponding in ex'- tent to the lengthof the socket c, is inserted,

so that the end of the piston-rod d bears hard against the bottom 0 ofthe socket c. 'lhrough 5 5 the opposite parts of the wall 0 adjacent andat right angles to their divided edges at each angle 0 are passed bolts6, which are preferably inv the same plane and at such a distance apartas to engage in opposite notches f formed thereat across thecorresponding angles of the piston-rod cl, so that on tightening up thebolts e by their nuts e the divided parts of the wall 0 of'the socket care drawn together and clamped to the piston-rod (Z, the bolts 6 at thesame time being locked within the notches f of the piston-rod (1,whereby the holder a is prevented from moving endwise along thepiston-rod cl and is firmly held thereto without the necessity ofreducing the end of the pis- 7o ton-rod and forming a keyway therein.

By this invention the jar of the chisel on striking the material to beoperated upon is transmitted by the bottom 0" of the socket (2 directlythrough the axis of the piston-rod (Z, instead of transversely throughthe key and shoulder thereof, as at present, and fracture of thepiston-rod cl thereby obviated.

In order to remove the tool when its shank becomes broken or wedged inthe socket, I form a key-slot g in the holder in rear of theto0lretaining key and at an angle thereto, so as to intersect the upperend of the toolsocket, in which key-slot a wedgeshaped key may beinserted to force the shank of the tool outward. 8 5

If desired, I may use more than two bolts 6 for clamping the dividedparts of the socket wall 0 to the piston-rod (Z; or, in lieu of dividingthe wall of the socket 0 into two parts, as described, the wall 0, asshown in Figs. 5 0 and 6, may be in one piece only, split longitudinallythrough one part of its circumference, in which case I may use a singlebolt (or bolts) e adjacent to the split part for engaging in acorresponding notch f formed in the piston-rod d.

If desired, I may dispense with the notches f in the piston-rod (Z abovedescribed, and arrange the bolts a as shown in Fig. 7, at such adistance apart transversely as to pass through 1 00 the divided portionsof the wall 0, clear of or in contact with the piston-rod (2, wherebythe full strength of the latter is maintained and the holder a securedthereto by the friction necting drills and like tools with piston-rods,

said stock having at one end a tool-socket and at the othera'longitudinally-split spring rodsocket, and devices for clamping thesame to the rod, substantially as described, whereby the perforation ofthe rod and stock at the point of greatest jar is avoided.

2. A detachable stock or tool-holder forconnecting drills and like toolsWith piston-rods, said stock having at one end a longitudinallysplitspring rod-socket and at the other end a tool-socket, and provided Witha transverse slot extending into the upper end of the toolsocket,substantially as and for the purposes described.

3. Astock or tool-holder for connecting drills and like tools withpiston-rods, said stock having at one end a longitudinally-s 'llitspringsocket of polygonal form for the reception of the end of thepiston-rod, clamping-bolts for causing the spring-socket to grip thepistonrod, and a tool-socket at the other end provided With a transversekey-slot and key, substantially as and for the purposes described.

4. Astock or tool-holder for connecting drills and like tools withpiston-rods, said stock having at one end a longitudinally-split spring-I socket of polygonal form for the reception of the end of acorrespondingly-shaped pistonrod having notches in its sides,clamping-bolts passing through the opposite jaws of the spring-socketfor causing them to grip the piston-rod, said bolts engaging the notchesin the piston-rod, a tool-socket at the other endprovi'ded with atransverse key-slot, and a second key-slot extending into the upper endof the tool-socket at right angles to the other key-slot, substantiallyas and for-the purposes described.

In testimony whereof I affix my signatu re, in presence of twoWitnesses, this 22d day of December, 1888.

GUSTAV A. EARTH.

\Vitnesses:

S. L. SCHRADER, PAUL BAKEWELL.

